JP2968855B2 - Plastics powder containing fuel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastics powder-containing fluid fuel which is easy to handle in transportation and storage, and which can be spray-burned.

[0002]

2. Description of the Related Art Various types of plastics products are used in large quantities in various fields, and their production is increasing year by year, accompanied by a large amount of plastic waste discharged (for example, In recent years, Japan's plastics production has exceeded 12 million tons per year, and the amount of plastics waste generated is said to be more than 5 million tons per year.) Has become.

As one of the solutions to such a problem, a method of reusing plastic waste as fuel has been proposed. However, plastics waste
When used as a solid fuel by simply crushing or being melt-molded into briquettes or pellets, there are the following problems: (i) Due to the high calorific value of plastics and excessive burning speed As a result, the combustion furnace not only wears and deteriorates in a short time, but also incomplete combustion frequently occurs due to a partial lack of oxygen. (ii) The plastics adheres to the combustion furnace wall due to the melt fluidization of the plastics, and the combustion is hindered. (iii) Since the particle size is relatively large, handling during transportation and storage is not only inconvenient, but also spray combustion by a burner cannot be performed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and to enable the effective use of plastics waste as a useful fuel.

[0005]

That is, the present invention provides a method for producing a powder having a particle size of 2.
The present invention relates to a fluid fuel obtained by dispersing a plastics powder having a size of 000 μ or less in an aqueous emulsion of water, methanol or fuel oil.

[0006] The plastics powder used in the present invention is not particularly limited as long as it is flammable, either thermoplastic or thermosetting. For example, (a) polyethylene, polypropylene, polyisobutylene, ethylene-vinyl acetate copolymer, etc. (B) acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene copolymer
(AS resin), acrylic resin such as poly (meth) acrylic acid (ester), (c) polybutadiene, polyisoprene, butadiene
Synthetic rubber or natural rubber such as styrene copolymer, (d) polyacetal, polyester, condensation polymer such as polyamide (nylon-6, nylon-6,6) and (e) vinyl chloride such as vinyl chloride and vinylidene chloride Thermoplastic resins such as base resins, and thermosetting resins such as (f) phenolic resins and (g) urea resins and melamine resins. In particular, in addition to polyolefin waste plastics such as polyethylene and polypropylene and polystyrene, which are largely discharged from industrial plastic waste, vinyl chloride waste plastics and waste tires are often used. In addition, waste plastics that are discarded after various plastics molded articles have been used temporarily or for a long time, or off-molded products, burrs, cutting residue or ears generated during molding of various plastics, or general Reduced volume solidified plastics (such as briquettes and pellets) separated from garbage can also be used.

[0007] The particle size of the plastics powder used in the present invention is 2000 µm or less, preferably 1000 µm or less, and especially 500 µm or less. It will be difficult. The form of the plastics powder is not particularly limited, but is preferably spherical, elliptical, or cubic, and rod-shaped or strip-shaped particles having a ratio of major axis to minor axis of 10 or more are not desirable for the present invention.

The plastics powder used in the present invention is usually prepared by pulverizing plastics waste by a dry or wet pulverization method to a particle size of 2,000 μm or less. Plastic waste plastics can also be obtained by pulverizing pellets reduced in volume by solidification by compression or rotary kiln. A hammer mill, a bin mill, a jet mill, or the like is used as a dry pulverization method, and a ball mill, a vibrating ball mill, a centrifugal ball mill, or the like is used as a wet pulverization method. In particular, as a method for obtaining fine powder, a jet mill or a vibrating ball mill is suitable.

In the present invention, (i) effective use of other fuels, (ii) adjustment of high calorific value and excessive burning rate of plastics, (iii) safety during transportation and storage, and (iv)
From the viewpoint of the cleanliness of the exhaust gas and the like, the above-mentioned plastics powder is used as a fluid fuel dispersed in an aqueous emulsion of water, methanol or fuel oil.

The fluid fuel containing the plastics powder of the present invention is obtained by mixing the plastics powder pulverized by a pulverizer with a medium such as an emulsion of water, methanol or fuel oil by using a mixing stirrer such as a kneader or a mixer. Alternatively, it can be produced by pulverizing with a medium such as water, methanol or an emulsion of fuel oil using a mixing and pulverizing machine such as a ball mill, a sand mill or an attritor.
The fluid fuel obtained in this way is usually stored in a tank on which a mixer or a rake is laid, to prevent sedimentation and flotation. Further, a dispersant may be used to increase the concentration of the plastics powder or to keep it stable during the production, and an emulsifier may be used to keep the emulsion stable.

The fuel oil used in the present invention is preferably a liquid which is liquid at 90 ° C. or lower, and is preferably a heavy oil. For example, kerosene, light oil, heavy oil, crude oil, tar oil, creosote oil,
Coal liquefied oil, animal and vegetable oil, waste oil and the like can be used. The ratio of water to fuel oil in the emulsion may be arbitrary, and W / O
Type or O / W type.

[0012] Among the fluid fuels containing the plastics powder of the present invention, the dispersing agents which can be used for those dispersed in water include various surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers and polyoxyethylene alkyl phenyl ethers. Non-ionic surfactants such as oxyethylene alkylphenol formalin condensate, polyoxyethylene alkylamides, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene-polyoxypropylene glycols, polyoxyethylene-polyoxypropylene glycol polyamines, Alkyl naphthalene sulfonates, polyoxyethylene alkyl ether sulfates, anionic surfactants such as polyoxyethylene alkyl ether phosphates and lignin sulfonates, Lid Ren sulfonate formalin condensate, polystyrene sulfonate, polycarboxylic acid salts such as polysulfone salt or poly (meth) acrylic acid salt, such as dicyclopentadiene sulfonates can be used.

Among the fluid fuels containing the plastics powder of the present invention, dispersants or emulsifiers which can be used for those dispersed in emulsions include various surfactants such as polyoxyethylene alkyl ethers and polyoxyethylene alkyl phenyl ethers. , Polyoxyethylene alkylphenol formalin condensates, polyoxyethylene alkylamides, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene-polyoxypropylene glycols, polyoxyethylene-polyoxypropylene glycol ethylenediamine, etc. Nonionic surfactants, fatty acid alkanolamine salts, alkyl sulfates, alkyl allyl sulfonates, dialkyl sulfosuccinates, polyoxyethylenes Emissions alkyl ether sulfates, anionic surfactants and long-chain primary amine salts such as polyoxyethylene alkyl ether phosphoric acid esters,
Cationic surfactants such as alkyltrimethylammonium salts, alkylpyridinium salts, and alkylquinolium salts, and amphoteric surfactants such as alkylbetaines, 2-alkylimidazoline derivatives, and N-alkyltaurine salts can be used.

Since the plastics powder-containing fluid fuel according to the present invention has a particle diameter of 2000 μm or less, it can be used not only for combustion on a fixed hearth such as a stoker but also for spray combustion using a burner.

Hereinafter, the present invention will be described with reference to examples. Example 1 A vinyl chloride film used for an agricultural vinyl house was heated and melted to form pellets, and then pulverized while cooling to obtain a vinyl chloride powder having an average particle diameter of 35 microns. This powder was dispersed in a 1% aqueous solution of a nonionic surfactant with a homomixer, and the powder concentration was 56 wt% and the viscosity was 480 cps (25 cps).
C) in water slurry.

EXAMPLE 2 A polypropylene pellet was pulverized with a ball mill together with water containing an anionic surfactant as a dispersant, and the average particle diameter was 7%.
A water slurry having 0 micron and a powder concentration of 35% was obtained. Further, bituminous pulverized coal having an average particle size of 40 microns was mixed with a kneader to obtain a polypropylene powder-pulverized coal-containing water slurry having the following properties. After standing for 10 days, there was no floating of the polypropylene powder or sedimentation of the coal. Powder concentration: 60 wt% Specific gravity (25 ° C): 1.03 Viscosity (25 ° C): 1240 cps Heat generation value: 5500 kcal / kg

Example 3 50 wt% of C heavy oil and 50 wt% of water were mixed and emulsified with a homogenizer to obtain a W / O emulsion. ABS resin powder pulverized to an average particle size of 45 microns was dispersed in this emulsion to obtain an emulsion fuel containing 38% of plastics powder. The properties of this fuel were as follows. Specific gravity (50 ° C): 1.05 Viscosity (50 ° C): 620 cps Heat value: 6100 kcal / kg

[0018]

According to the present invention, plastics powder is prepared by using general and industrial plastics waste, and a fluid fuel is provided using the plastics powder. Waste can be effectively reused as fuel resources. The fuel using the plastics powder obtained according to the present invention can be handled not only as a fluid in transportation and storage, but also in spray combustion by a burner in combustion. Furthermore, since it contains almost no inorganic components, it is useful as a clean fuel. Heavy oil, pulverized coal, coal-water slurry
(CWM) and coal-oil slurry (COM).

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-110608 (JP, A) JP-A-54-58710 (JP, A) JP-A-48-44303 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) C10L 1/32 C10L 5/00-5/48

Claims (1)

(57) [Claims] 1. A fluid fuel comprising a plastics powder of 2000 μ or less dispersed in an aqueous emulsion of water, methanol or fuel oil.